Update mychain.py

mychain.py

@@ -1,4 +1,4 @@
-mport os
+import os
 import json
 import hashlib
 import datetime
@@ -64,11 +64,12 @@ class MyChain:
             return block
     def print_previous_block(self):
         return self.chain[-1]
-    def new_transaction(self, sender, recipient, amount):
+    def new_transaction(self, sender, recipient, amount, balance):
         transaction = {
             'sender': sender,
             'recipient': recipient,
-            'amount': amount
+            'amount': amount,
+            'balance': balance            
         }
         self.pending_transactions.append(transaction)
     def proof_of_work(self, previous_proof):